试图让Traefik识别CockroachDB仪表板

Question

• Windows 10上的UsingMiniKube
• 我安装了特雷菲克，按照这里的指令，使用了一个Daemonset

我使用以下方法安装了CockroachDB (CD)：

helm install --name my-release-cockroachdb stable/cockroachdb

在创建服务时，我希望Traefik能够找到CockroachDB仪表板，但它没有。所提供的服务如下：

{
  "kind": "Service",
  "apiVersion": "v1",
  "metadata": {
    "name": "my-release-cockroachdb-cockroachdb",
    "namespace": "default",
    "selfLink": "/api/v1/namespaces/default/services/my-release-cockroachdb-cockroachdb",
    "uid": "00316801-a468-11e8-8b41-00155d296111",
    "resourceVersion": "16247",
    "creationTimestamp": "2018-08-20T10:58:42Z",
    "labels": {
      "chart": "cockroachdb-1.2.2",
      "component": "my-release-cockroachdb-cockroachdb",
      "heritage": "Tiller",
      "release": "my-release-cockroachdb"
    },
    "annotations": {
      "prometheus.io/path": "_status/vars",
      "prometheus.io/port": "8080",
      "prometheus.io/scrape": "true",
      "service.alpha.kubernetes.io/tolerate-unready-endpoints": "true"
    }
  },
  "spec": {
    "ports": [
      {
        "name": "grpc",
        "protocol": "TCP",
        "port": 26257,
        "targetPort": 26257
      },
      {
        "name": "http",
        "protocol": "TCP",
        "port": 8081,
        "targetPort": 8081
      }
    ],
    "selector": {
      "component": "my-release-cockroachdb-cockroachdb"
    },
    "clusterIP": "None",
    "type": "ClusterIP",
    "sessionAffinity": "None",
    "publishNotReadyAddresses": true
  },
  "status": {
    "loadBalancer": {}
  }
}

和

{
  "kind": "Service",
  "apiVersion": "v1",
  "metadata": {
    "name": "my-release-cockroachdb-cockroachdb-public",
    "namespace": "default",
    "selfLink": "/api/v1/namespaces/default/services/my-release-cockroachdb-cockroachdb-public",
    "uid": "002ec344-a468-11e8-8b41-00155d296111",
    "resourceVersion": "16186",
    "creationTimestamp": "2018-08-20T10:58:42Z",
    "labels": {
      "chart": "cockroachdb-1.2.2",
      "component": "my-release-cockroachdb-cockroachdb",
      "heritage": "Tiller",
      "release": "my-release-cockroachdb"
    }
  },
  "spec": {
    "ports": [
      {
        "name": "grpc",
        "protocol": "TCP",
        "port": 26257,
        "targetPort": 26257
      },
      {
        "name": "http",
        "protocol": "TCP",
        "port": 8081,
        "targetPort": 8081
      }
    ],
    "selector": {
      "component": "my-release-cockroachdb-cockroachdb"
    },
    "clusterIP": "10.105.70.122",
    "type": "ClusterIP",
    "sessionAffinity": "None"
  },
  "status": {
    "loadBalancer": {}
  }
}

这最终告诉我，我可以使用：

kubectl port-forward my-release-cockroachdb-cockroachdb-0 8080

若要访问CD仪表板，请执行以下操作。正如我估计的那样，Traefik已经消耗了8080，我编辑了这些服务(如您在上面看到的使用8081)，然后：

kubectl port-forward my-release-cockroachdb-cockroachdb-0 8081

但这就产生了：

E0820 21:33:59.676164  432152 portforward.go:331] an error occurred forwarding 8081 -> 8081: error forwarding port 8081 to pod 8b7db5a2feed08f1bc329db69f9623a0c548d5ffae002236c5d7a4181ba326d3, uid : exit status 1: 2018/08/20 11:33:57 socat[44354] E connect(5, AF=2 127.0.0.1:8081, 16): Connection refused
E0820 21:33:59.681160  432152 portforward.go:331] an error occurred forwarding 8081 -> 8081: error forwarding port 8081 to pod 8b7db5a2feed08f1bc329db69f9623a0c548d5ffae002236c5d7a4181ba326d3, uid : exit status 1: 2018/08/20 11:33:57 socat[44355] E connect(5, AF=2 127.0.0.1:8081, 16): Connection refused

所以我的问题是：

1. 如何让Traefik自动检测CockroachDB服务，特别是CockroachDB管理GUI
2. 如何连接到Traefik背后的蟑螂管理GUI？

Answer 1

舵机图表中的cockroach-statefulset.yaml从不在启动命令中设置http端口。

你需要这样做：

• 将CockroachDB UI的端口保留在:8080上
• 或者:正确地将自定义端口一直传递到cockroach start命令行。这可以通过--http-port标志来完成。